According to Dutch news agency DPA, Egypt pumped water from the Mediterranean Sea into the tunnels, making good on threats it made to Hamas last month.

Egyptian officials apparently intend to turn the tunnels, and the border region, into a series of fish farms.

As part of Egypt’s ongoing crackdown on terrorism, Egypt is establishing a buffer zone along the border with Gaza. The buffer zone was initially planned to be 500 meters wide, but was later expanded by another 500 meters.

Rafah, in particular, is Gaza’s only gateway to the outside world, and Egypt has kept it mostly closed since the Hamas terrorist group seized control of the area in 2007.

Egyptian authorities have kept the crossing virtually sealed since a terrorist attack in the Sinai Peninsula in October 2014, though they have temporarily reopened the crossing several times.

Sources in Egypt have revealed that Hamas terrorists had provided the weapons for the lethal attacks in October, which killed 30 soldiers, through one of its smuggling tunnels under the border to Sinai. Hamas denies the allegations.